Propeller-shaft-brake mechanism



Nov. 2o, 192:5.

'J. C. HAGGART, JR

PROPELLER SHAFT BRAKE MECHANISM Fild sept. 2e. 1925 2 sheets-sheet 1 Illlllllll Nov. 20, 1928.

J. c. HAGGART, JR

PROPELLER SHAFT BRAKE MECHANISII Filed sept. 2651923 2 sheets-smet 2 Z D l 1j j i 3735 l 1|.. y mi im, "l l l M Patented Nom-.20, 1928.

UNITED l 1,691,979 ATENT JOHN o. HaGqART, TR-r, or ALMA, MICHIGAN, AssIGNoR, BY MESNE AzissI-eini!,E'II'JFSfA T nETRcIT PATENTS HOLDING COMPANY, or DETROIT,I MICHIGAN, ACORPORACIION l' MICHIGAN.

i'toPELLEn-sHAFr-BRAE MEcHAIsivI. v

Apliication md september 26, ms. serial no. 664,879;

Various t-ypes of m'otorvehicles, particula'rly trucks, have brakes ,applied to some revolving' part or body, other than vehicle Wheels or brake drumsassociated ther'evvith. For instance, the brake mechanism is associated with a propeller shaft and brake 'shoes applied eXteri'orly of a brake drum in contradistinetion to an interior arrangement of brake shoes, such disclosed in my companion Vapplication' filed under even date.

This invention involves a novel and Compact brake mecl'iani'sm for servicel and emer gency brakes of a truck, the mechanism being lsupported adjacent the universal coupling of a propeller` shaft so that the service brake may function in, connection with the propeller shaft and the emergency brake mechanism function at the Wheels of a vehicle equipped with my brake mechanism. The subject matter of this application may be considered as relating particularly to a service brake, compared to a brake mechanism, such as disclosed in my companion application, Which Vmay be considered an emergency brake, although r adaptedy for general braking purposes.

This invention is particularly 'character-v ized by an exterior arrangement of fulcrumed shoes relative toa brake drum mounted about a propeller shaft and the arrangement is such that the brake shoes may be .simultaneously actuated to bring pressure to bear at diametrically opposed points, relative to the propellersliaft, so as to insure a uniform application of the brakes Without setting' up stresses and strains Which would have a tendency to displace the propeller shaft, parts of the braking mechanism, and cause unnecessary Wear and tear on bearings and other parts of a vehicle.

My invention is :further characterized by a novel propeller shaft bearing Which also serves as a bearing for emergency brake rock shafts` the bearing affording supporting means for service brake shoes, and the complete assembly is vsuch thateasy access may be had to eachand every part and the brake mechanism readily installed in the chassis of a motor vehicle. y*

Other advantages gained by my invention will appear as the construction of the brake mechanism is described. by aid of the dravv# inpjtavherein Figure l is a perspective mechanism View of a brake Fig. 2 is a lgitudnal sectional view of the same;

i Fig; 3 is a and .Fig 4 is an end view 'of the brake-mchanism. Y

The reference numeral 1 `denotes si'de pianti the brake rne'ch'maisis-,A f

frames of a truck chassis connected by a.

transverseA member 2 and lattached to the transverse member 2 are brackets ,3 h'zivilg sleeve clamping portions 4j in which is fixed a tubular sup ort havig end bearings 6 for a rocl sha .t 7, said rock shaft having" one end thereof journaled in another bracketY carried by the member 2j.

9 denotes a crank loose on the rock shaft 7 at the side of one of thebraclets 3", said crankv being' held against loihgitndirall displacement by a collar 10 finedv O'n the 'I'ck shaft.V The outer end of the crank 9 is operativelycnnetcted to an emergency brake lrod 11 and jacent the outer end 'of said crank is :El/(':cnnection 12 for an equalizingmember 13 attac'rlied` to a connection 141 of another 'crank 15 iie'd` on the lrock shaft T adjacent the bracket 8,. Pivotally connected tothe equalizin'g' member 13', intermediate the ndsfthereof, is an op;r

erating;r rodA 16 extendingy through an open@ ing 17 in thetransver-se member 2 and adapted to extend to the dash, cab or operators seat of the truck so'that it may be actuated t apr ply the emergency brakes'. y

18 denotes another crank mounted n the opposite end of the rock' shaft 7 fIiOI-Ilv the crank 15 and the upperehd of the crank 18v is operativclIl connected togaothfer emergency' brake rod 19, the rods 19 and 11 being! best shown' in Fig. 1. v 2O denotes a sleeve .clamping portion of hanger 21, said sleeve clampingpprton being fixed on the tubular support 5 between the brackets 3. The hanger 21 is provided with" an antifricticnal bearing 2Q' for ai propeller shaft 23 coupled to a universal' 24,'said universal joint ofa conventional form such as remployed for connecting drive and driven shafts which do ,noti at' all times remain in alinemert. f I Y m 25 denotes ai Brake drum attached' to that` member' f the imiteren joint aewhieh roy t'ates the prpelIer' .slfty234 brak@ dem @fclose meer @einen 2i, thus permitting' of tHe' b'rakecrtfoling mechanism being compactly assembled in he upper ends 29 ot the shoe supports are apertured and loosely extending through the ends 29 ot said shoe supports is a transverseiy disposed rod 3 0 having screw threads :for takeup nuts 3i and 32. Associated with the tale-up nuts Eil are spring retainers 33 y eeoperatine' with other spring retainers in si g; the end convolutions of coiied sprinps encirclingv the `rod 30, which entends through a bracket 36 attached to the sieeve damping;

' portion 2O of the hanger 2l., said bracket overhanging the `brake drinn as best shown in Figs. 2 and 3. rlhe rod 30 loosely extends through the braket and one cic the springs is at each side oi the braket with the take-up nuts 3i ari" "ged so tl'iat the teusion of one ot said spi .eggs may be r-.dfuisfl d to equal the tension oi the other spring.

` 3'? and 38 denote Wear members eirbracinfr the upper'ends 29 ofthe shoe sui )erts The Wear ineinber is .held in piace by the nut 32on one endo'f the rod 30, and the Wear qun nieinberV 37 is held in place by a cani 39 on the end 'of a horizontally disposed crank 40 pivotally connectech as at 4l, to the head of the rod 30. `,"iheouter end of the crank 40 has a series or apertures 43 and operative lyconn'eeted tothe apertured outer end oi said crank is a service brake rod 44 extending through an opening 45"L in the transverse member 2. rtheA service brake rod 44 is adapted to extend to the dash, cab or operators seat of the truck so that it may be convenientll actuated to apply the service brake.

45 denotes brake Vshoes having liners 46 adapted to engage the periphery ot the brake druin T he shoes 45 have reinforced apertured ears 47 iiuleruined on pins 48 carried by the shoe supports 28, and by reference to Fig. 4 it Will be noted that they pivot pins are in the saine horizontal plane as the p opeller shaft 23 and that the shoes 45 are diainetrically opposed and are adapted to engage equal portions 01"' the brake'drin'n Since Vthe shoes are :tulcruined intermediate the ends thereof said shoes niay have an equalizing or seit-adjustingaction relative to theperiphery of the brake drum 25. Fun

therinoi'e, the location of the brake shoes is such as to avoid torsional stresses and strainsV which would have a tendency to displace the propeller shaft 23, at least, subject the bearH ings of said shaftto considerable Wear.

49 denotes expansion springs located in pockets 50 adjacent the upper ends of the causes the rod 30 and one ot the shoe supportsA to be shifted in an opposite direction troni the other shoe support7 both shoe supports ,Y moving' towards the brake drum 25 to apply f the brake shoes 45. lt is by virtue of the cani 39 that the servire brake can be gradually appiied and just as gradually released. it isgood practice 'to provide-a bearthe propeller shaft, adjacent the uniand necessary to provide beari- 93's 'for the onerg'ency brake rock shafts 7, l have found that the eniergencybrake niecnf anisin can be conveniently associated Withfthe service brake mechanism whereby the support-in nieans of the emergency b alie nlechanisn'i may be utilized 'for supporting the or the propeller shait and the greater 1ie service brake mechanism with thev i s vbracket 52, carried vby the Abor 2 lior the cani crank 40 rining part oi" the service brake inechau sin. 'V37 ith aii 'ot n the brake inechanisni pactly assembled at the transverse nien'i- 2., it is assembly that l A-acedV in position reiative to theV propeiler 'sl-)aft and tbe brake di i, and this is acyiplished Without interii'erngg with any other devices supiiorted in or by ot the truck.

'it to be understood that the structural' elements entering into my invei'ition are susceptible tosuch changes as are perniissibl@l by.

the aj'ipended clainx.

What i claini is :--VA I ln a brake mechanism, lthe combination with a propeller shait, a brake drinn rotatable with said shaft, of brackets adjacent said brake drinn, a tubular support in seid brackets, an operating rock shaft pas tln'ough said support, a han ger on said' tubio iai support extend into said brake druni anda. is in supporting said propelier shaft, said hanY .l extending out oi" said bre e drinn and there-l Jr., shoe supports attached to that portion oi said hanger under said brake drum7 shoes pivotally connected to said supports and engageable '.ufith said brake drunn and' means supported from said hanger above said` brake druin for adjusting said shoe supports'.

in testimony vvhereoi I ax rny signature.

JOHN C. HAGGRT, da

iig a portion tin-weetV the chassis 

